Urology Practice Questions

Q: A man was brought to the emergency department after a perineal injury. He experiences an urge to micturate but is unable to pass urine. Blood is seen at the tip of the urethra, and there is swelling of the penis and scrotum. What is the most likely diagnosis?

Bulbar urethra injury. **Explanation:** The clinical presentation describes a classic case of **Bulbar Urethra Injury**, which is the most common site of anterior urethral trauma. **1. Why Bulbar Urethra Injury is correct:** The mechanism of injury is typically a **straddle injury** (perineal trauma), where the bulbar urethra is crushed against the pubic symphysis. The hallmark triad seen here includes: * **Urethrorrhagia:** Blood at the external meatus. * **Urinary retention:** Inability to void despite the urge. * **Butterfly Hematoma/Swelling:** If Buck’s fascia is breached, urine and blood extravasate into the scrotum and penis, limited by Colles' fascia (explaining the specific swelling pattern). **2. Why other options are incorrect:** * **Penile Urethra Rupture:** Usually occurs due to a "fracture" of the penis during intercourse. While it causes swelling, it is less common than bulbar injury in perineal trauma. * **Membranous Urethra Injury:** This is a **posterior urethral injury**, almost always associated with **pelvic fractures** (e.g., RTA). Key findings include a "high-riding prostate" on DRE and extravasation into the retropubic space (Space of Retzius), not the scrotum. * **Urinary Bladder Injury:** Intraperitoneal rupture presents with signs of peritonitis; extraperitoneal rupture is associated with pelvic fractures. Neither typically presents with blood at the urethral meatus or scrotal swelling. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Retrograde Urethrogram (RUG). **Never** attempt catheterization before RUG if urethral injury is suspected. * **Fascial Boundaries:** Extravasation in bulbar injury is limited by **Colles' fascia** (continuous with Scarpa’s fascia of the abdomen), preventing spread to the thighs but allowing spread to the abdominal wall. * **Management:** Initial management involves a **Suprapubic Cystostomy (SPC)** to divert urine.

Q: What is the most common site of genitourinary tuberculosis?

Kidney. **Explanation:** Genitourinary tuberculosis (GUTB) is the second most common form of extrapulmonary tuberculosis. The **Kidney** is the primary site of infection in the genitourinary tract. **Why Kidney is the Correct Answer:** The infection is almost always **hematogenous**, spreading from a primary focus (usually the lungs) via the bloodstream. The bacilli lodge in the highly vascularized glomerular and peritubular capillaries. Initially, these form microscopic cortical granulomas. If the body's immunity fails, these granulomas enlarge and rupture into the nephron, leading to "Putz's cast" (tuberculous debris) and the characteristic "moth-eaten" appearance of calyces on imaging. **Analysis of Incorrect Options:** * **Ureter:** Involvement is always **secondary** to renal TB. It occurs via "descending infection" through the urine. It commonly results in strictures, particularly at the ureterovesical junction (UVJ). * **Bladder:** This is also a secondary infection caused by infected urine from the kidney. It leads to characteristic findings like "golf-hole ureters" and a "thimble bladder" (fibrosed, low-capacity bladder). * **Urethra:** This is the least common site of GUTB and usually occurs secondary to advanced bladder or prostatic tuberculosis. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Sign:** Sterile pyuria (pus cells in urine with no growth on routine culture). * **Earliest Radiological Sign:** Erosion/fuzziness of the minor calyces (moth-eaten appearance). * **Gold Standard Diagnosis:** Urine culture for *M. tuberculosis* (Lowenstein-Jensen medium), typically requiring three to five consecutive early morning midstream urine samples. * **Key Pathognomonic Finding:** Putty Kidney (autonephrectomy) – a non-functioning, calcified kidney seen in end-stage disease.

Q: In children, persistent priapism may result due to which of the following conditions?

Leukemia. **Explanation:** **Priapism** is defined as a persistent, usually painful, penile erection lasting more than 4 hours, unrelated to sexual stimulation. In the pediatric population, the etiology differs significantly from adults. **Why Leukemia is the Correct Answer:** Leukemia (specifically Chronic Myeloid Leukemia or Acute Lymphoblastic Leukemia) is the **most common non-sickle cell cause** of priapism in children. The underlying mechanism is **hyperviscosity** and **leukostasis**. A massive increase in the white blood cell count leads to the sludging of cells within the corpora cavernosa and the dorsal venous complex, obstructing outflow and resulting in an ischemic (low-flow) priapism. **Analysis of Incorrect Options:** * **A. Thrombosis of the venous plexus:** While venous obstruction is the end-result of ischemic priapism, primary idiopathic thrombosis is rare in children and usually secondary to an underlying hematological malignancy or sickle cell disease. * **C. Wilms' tumor:** This is the most common renal tumor in children, but it typically presents with an abdominal mass and hematuria. It does not cause priapism. * **D. Trauma:** Perineal or penile trauma usually causes **non-ischemic (high-flow) priapism** due to the formation of an arterial-lacunar fistula. While possible, it is less common as a systemic "condition" compared to the classic association with leukemia in pediatric exams. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause overall in children:** Sickle Cell Disease (approx. 65%). * **Most common malignancy-related cause:** Leukemia. * **Initial Investigation:** A Complete Blood Count (CBC) is mandatory in any child presenting with priapism to rule out leukemia or infection. * **Management:** Ischemic priapism is a surgical emergency requiring aspiration and irrigation; high-flow (traumatic) priapism is often managed conservatively.

Q: What is a predisposing factor for testicular germ cell tumors?

All of the above. **Explanation:** Testicular Germ Cell Tumors (GCTs) arise from germ cell neoplasia in situ (GCNIS). The development of these tumors is strongly linked to **Testicular Dysgenesis Syndrome**, where abnormal testicular development increases malignancy risk. * **Cryptorchidism (Undescended Testis):** This is the most significant risk factor. The risk of GCT is increased 4 to 10 times compared to the general population. Notably, the risk remains elevated even after orchiopexy, and the contralateral (normally descended) testis also carries a slightly higher risk. * **Testicular Feminization Syndrome (Complete Androgen Insensitivity Syndrome):** Individuals with a 46,XY karyotype and female phenotype have undescended testes (often intra-abdominal). There is a significant risk of developing **gonadoblastomas** or seminomas, necessitating prophylactic gonadectomy after puberty. * **Klinefelter’s Syndrome (47,XXY):** While primarily associated with primary testicular failure and infertility, patients have a significantly higher incidence of **extragonadal germ cell tumors**, particularly in the mediastinum. **Clinical Pearls for NEET-PG:** 1. **Most common GCT:** Seminoma (overall), but Yolk Sac Tumor is most common in children. 2. **Orchiopexy Timing:** Performing orchiopexy before puberty (ideally before age 1) reduces but does not eliminate the risk of malignancy; however, it makes the testis accessible for clinical examination. 3. **Genetic Marker:** Isochromosome **12p** [i(12p)] is found in almost all GCTs. 4. **Tumor Markers:** LDH (bulk), AFP (Yolk sac/Teratoma), and hCG (Choriocarcinoma/Seminoma). *Note: AFP is never elevated in pure seminoma.*

Q: In Benign Prostatic Hyperplasia (BPH), which lobe is most commonly involved?

Median lobe. **Explanation:** In Benign Prostatic Hyperplasia (BPH), the **Median lobe** (middle lobe) is the most commonly involved and clinically significant lobe. Pathologically, BPH originates in the **Transition Zone** (McNeal’s classification), which corresponds anatomically to the periurethral region and the median lobe. As this lobe enlarges, it projects into the bladder floor, often acting as a "ball-valve" mechanism that obstructs the internal urethral orifice, leading to significant Lower Urinary Tract Symptoms (LUTS). **Analysis of Options:** * **Median Lobe (Correct):** This is the primary site of adenomatous growth in BPH. Its enlargement is responsible for the classic "middle lobe projection" seen on cystoscopy or ultrasound. * **Lateral Lobes:** These are also frequently involved in BPH and contribute to urethral compression; however, the median lobe is traditionally cited as the most characteristic site of hyperplasia leading to obstruction. * **Posterior Lobe:** This lobe corresponds to the **Peripheral Zone**. This is the most common site for **Prostate Cancer**, not BPH. It is easily accessible via Digital Rectal Examination (DRE). * **Anterior Lobe:** This is largely fibromuscular stroma and contains very little glandular tissue; it is rarely involved in pathological processes like BPH or carcinoma. **High-Yield Clinical Pearls for NEET-PG:** * **Zonal Anatomy:** BPH occurs in the **Transition Zone**, while Prostate Cancer occurs in the **Peripheral Zone**. * **DRE Findings:** In BPH, the prostate feels smooth, rubbery, and the median sulcus may be obliterated. In Carcinoma, it feels hard and nodular. * **Surgical Landmark:** During TURP (Gold Standard treatment), the **verumontanum** is the key landmark used to avoid damaging the external sphincter.

Q: What characteristic of struvite (ammonium magnesium phosphate) stones makes antibiotics ineffective during treatment?

Inaccessibility of bacteria to antibiotics. ### Explanation **Correct Answer: D. Inaccessibility of bacteria to antibiotics** Struvite stones (Magnesium Ammonium Phosphate) are also known as **"infection stones"** because they form in the presence of urea-splitting organisms like *Proteus*, *Klebsiella*, and *Pseudomonas*. These bacteria produce the enzyme **urease**, which hydrolyzes urea into ammonia, raising urinary pH (>7.2). The core reason antibiotics fail is that the bacteria become **sequestered within the interstices of the stone matrix**. The stone acts as a physical nidus where bacteria are protected from both the host’s immune system and systemic antibiotics. Unless the stone is completely surgically removed, these "trapped" bacteria will continue to cause recurrent urinary tract infections (UTIs) and promote further stone growth. **Analysis of Incorrect Options:** * **A & C:** While antibiotic resistance can occur, it is not the primary reason for treatment failure. Even if the bacteria are sensitive to the antibiotic in a lab culture, the drug cannot penetrate the mineralized stone architecture to reach the bacteria at the core. * **B:** Most antibiotics used for UTIs (like Fluoroquinolones or Aminoglycosides) have excellent renal excretion and high urinary concentrations; the issue is the physical barrier of the stone, not the excretion level. **High-Yield Facts for NEET-PG:** * **Composition:** Magnesium Ammonium Phosphate and Calcium Carbonate Apatite. * **Morphology:** They typically form **Staghorn Calculi**, filling the renal pelvis and calyces. * **Radiology:** They are **radio-opaque** (though less dense than calcium oxalate). * **Pathogenesis:** High urinary pH (alkaline urine) is essential for precipitation. * **Treatment Gold Standard:** **PCNL (Percutaneous Nephrolithotomy)** to ensure complete clearance of all stone fragments ("sterilization of the collecting system").

Q: A patient presents with hematuria for many days. Investigations reveal renal calculi, calcifications in the wall of the urinary bladder, and a small contracted bladder. What is the most probable cause?

Schistosomiasis. ### Explanation The correct answer is **Schistosomiasis** (specifically *Schistosoma haematobium*). **Why Schistosomiasis is correct:** The triad of **hematuria, bladder wall calcification, and a small contracted bladder** is classic for chronic urinary schistosomiasis. The parasite eggs are deposited in the bladder wall, leading to a granulomatous reaction and intense fibrosis. * **Calcification:** The characteristic "fetal head" or "eggshell" calcification seen on X-ray represents the calcified eggs within the bladder wall. * **Contracted Bladder:** Chronic fibrosis leads to a loss of bladder compliance and reduced capacity (thimble bladder). * **Renal Calculi:** Stasis and secondary infections due to ureteric strictures often lead to stone formation. **Why the other options are incorrect:** * **Tuberculosis (TB):** While TB causes a "thimble bladder" and hematuria, **bladder wall calcification is rare** in TB. In TB, calcification is more common in the renal parenchyma (putty kidney). * **Amyloidosis:** This can cause hematuria and bladder thickening, but it does not typically present with the specific pattern of wall calcification and stone formation described. * **Carcinoma of the Urinary Bladder:** While Schistosomiasis is a risk factor for **Squamous Cell Carcinoma**, the primary malignancy itself presents as a mass lesion rather than diffuse wall calcification and a contracted bladder. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of calcification:** Terminal ureter and bladder wall. * **Pathognomonic sign:** "Eggshell" calcification of the bladder. * **Malignancy Risk:** Chronic Schistosomiasis is strongly associated with **Squamous Cell Carcinoma** (SCC) of the bladder, unlike the more common Transitional Cell Carcinoma (TCC). * **Drug of Choice:** Praziquantel.

Question 1

A man was brought to the emergency department after a perineal injury. He experiences an urge to micturate but is unable to pass urine. Blood is seen at the tip of the urethra, and there is swelling of the penis and scrotum. What is the most likely diagnosis?

Accepted Answer

Bulbar urethra injury

Answer

Penile urethra rupture

Answer

Membranous urethra injury

Answer

Urinary bladder injury

Question 2

What is the most reliable investigation in bladder rupture?

Accepted Answer

Retrograde cystogram

Answer

Intravenous pyelogram (IVP)

Answer

Cystoscopy

Answer

Catheterisation

Question 3

What is the most common site of genitourinary tuberculosis?

Accepted Answer

Kidney

Answer

Ureter

Answer

Bladder

Answer

Urethra

Question 4

Postmicturition dribbling is due to

Accepted Answer

Collection of urine in the U-shaped curve of the bulb of the penis

Answer

Detrusor overactivity

Answer

Urethral stricture causing decreased dribbling

Answer

Neurogenic bladder

Question 5

In assessing lower urinary tract symptoms (LUTS) in men, which of the following statements is false?

Accepted Answer

Cystourethroscopy is a good guide as an indication for surgery.

Answer

Changing patient's symptoms according to the International Prostate Symptom Score (IPSS) is routinely used.

Answer

Flow rate measurement studies and pressure-flow urodynamic studies are done.

Answer

A thorough nervous system examination is mandatory.

Question 6

In children, persistent priapism may result due to which of the following conditions?

Accepted Answer

Leukemia

Answer

Thrombosis of the venous plexus

Answer

Wilms' tumor

Answer

Trauma

Question 7

What is a predisposing factor for testicular germ cell tumors?

Accepted Answer

All of the above

Answer

Cryptorchidism

Answer

Testicular feminization syndrome

Answer

Klinefelter's syndrome

Question 8

In Benign Prostatic Hyperplasia (BPH), which lobe is most commonly involved?

Accepted Answer

Median lobe

Answer

Lateral lobe

Answer

Posterior lobe

Answer

Anterior lobe

Question 9

What characteristic of struvite (ammonium magnesium phosphate) stones makes antibiotics ineffective during treatment?

Accepted Answer

Inaccessibility of bacteria to antibiotics

Answer

Presence of resistant bacteria

Answer

Poor excretion of antibiotics

Answer

Ineffectiveness of common antibiotics

Question 10

A patient presents with hematuria for many days. Investigations reveal renal calculi, calcifications in the wall of the urinary bladder, and a small contracted bladder. What is the most probable cause?

Accepted Answer

Schistosomiasis

Answer

Amyloidosis

Answer

Tuberculosis

Answer

Carcinoma of the urinary bladder

Urology — MCQs

Urology — MCQs

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